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Materials : Zirconia (ZrO2)

Zirconia grades are various. They differentiate from each other by the nature of the stabilising agent which is used. In its pure form, zirconia is not stable. Magnesia-partially-stabilised zirconia (MgO-PSZ) and yttria-partially stabilised zirconia (Y-TZP) in particular offer an outstanding resistance to mechanical shocks as well as to flexural load, because of their high fracture toughness and relative “ elasticity ”. These two zirconias are advanced ceramics of choice for severe mechanical applications. Other grades in fully stabilised composition exist and are mostly used for high-temperature applications.

Selection of materials

Microcertec offers those two types of zirconias that are mostly requested on the market, in pressed and extruded grades :

  • magnesia-partially-stabilised zirconia (MgO-PSZ)
yttria-partially-stabilised zirconia (Y-TZP)


MgO-PSZ and Y-TZP zirconias have the following features :

  • high density
  • high flexural strength (> 500 MPa for Mgo-PSZ and > 800 MPa for Y-TZP)
  • very high fracture toughness
  • good wear resistance
  • low thermal conductivity (10 x less than alumina)
  • good resistance to thermal shocks
  • resistance to chemical attacks
  • electrical conductivity at high temperature
  • fine surface finish easily achievable

Our typical applications

Mg-O and Y-TZP zirconias are ceramic materials that are widely used in the following applications :

  • plungers and valves for dosing pumps (food, medical, pharmaceutical industries)
  • tube and ring faces for mechanical seals
  • wear parts for mechanical processing equipment
  • components for metrology equipment

pins & guides for handling devices for FPD glass sheets in coating machines


Material properties datasheet : ceramics and quartzMaterial properties datasheet : ceramics and quartz (1472 Ko)